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    <title>栅格系统</title>
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                <li class="active"><a href="#">python</a></li>
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        <div class="col-sm-9">这是主体</div>


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            <li class="active"><a href="#">python</a></li>
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        <ul class="nav nav-tabs">
            <li class="active"><a href="#">python</a></li>
            <li><a href="#">html</a></li>
            <li><a href="#">css</a></li>
            <li><a href="#">shell</a></li>
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    <div class="row">
        <div class="bg-primary col-lg-3 col-md-4 col-sm-6">
            云计算<br>
            nds 1907
        </div>
        <div class="bg-success col-lg-3 col-md-4 col-sm-6">
            云计算<br>
            nds 1907
        </div>
        <div class="bg-warning col-lg-3 col-md-4 col-sm-6">
            云计算<br>
            nds 1907
        </div>
        <div class="bg-info col-lg-3 col-md-4 col-sm-6">
            云计算<br>
            nds 1907
        </div>
        <div class="bg-danger col-lg-3 col-md-4 col-sm-6">
            云计算<br>
            nds 1907
        </div>
        <div class="bg-primary col-lg-3 col-md-4 col-sm-6">
            云计算<br>
            nds 1907
        </div>
    </div>
</div>
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